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What percent of 3.8 is 38?
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If 3.8 represents 100%, 38 represents ten times that amount, or 1000%. A general method of solving these kinds of problems is to set up a ratio. Three point eight is to a hundred as 38 is to x, and solve for the unknown:
1) 3.8/100 = 38/x
2) 3800 = 3.8x
3) 1000 = x
Posted by enotechris on January 13, 2009 at 11:52 PM (Answer #1)
Middle School Teacher
With percent questions the best way to do it is to use the formula %/100 = is/of. I teach my students this and it works every time.
Your question "What percent of 3.8 is 38?" will fit right into the formula. % is the unknown, so it goes in the formula as x. Of is the number 3.8, and is will be 38. Fill these into the formula, cross multiply and solve for x.
x/100 = 38/3.8 (cross multipy)
3.8x = 3800 (divide both sides by 3.8 to get x alone)
3.8x/3.8 = 3800/3.8
x = 1000%
This makes sence because 3.8 is much smaller than 38, so it makes sence that 38 is 1000% higher than 3.8. Hope this helps. :)
Posted by kborgeson on March 13, 2009 at 10:37 AM (Answer #2)
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